Unsteady Three-Dimensional Behavior of Natural Convection in Horizontal Annulus

Toshizo Ohya, Yasutomi Miki, Koji Morita, Kenji Fukuda, Shu Hasegawa

Research output: Contribution to journalArticle

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Abstract

An numerical analysis has been performed on unsteady three-dimensional natural convection in a concentric horizontal annulus filled with air. The explicit leap-frog scheme is used for integrating three-dimensional time-dependent equations and the fast Fourier transform (FFT) for solving the Poisson equations for pressure. An oscillatory flow is found to occur at high Rayleigh numbers, which agree qualitatively with the experimental observation made by Bishop et al. An experiment is also conducted to measure temperature fluctuations; a comparison between periods of fluctuations obtained numerically and experimentally shows a good agreement. Numerical calculations yield various statistical parameters of turbulence at higher Rayleigh numbers, which wait experimental verifications, however.

Original languageEnglish
Pages (from-to)87-96
Number of pages10
JournalNippon Genshiryoku Gakkaishi/Journal of the Atomic Energy Society of Japan
Volume30
Issue number1
DOIs
Publication statusPublished - Jan 1 1988

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Poisson equation
Natural convection
Fast Fourier transforms
Numerical analysis
Turbulence
Air
Experiments
Temperature

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering

Cite this

Unsteady Three-Dimensional Behavior of Natural Convection in Horizontal Annulus. / Ohya, Toshizo; Miki, Yasutomi; Morita, Koji; Fukuda, Kenji; Hasegawa, Shu.

In: Nippon Genshiryoku Gakkaishi/Journal of the Atomic Energy Society of Japan, Vol. 30, No. 1, 01.01.1988, p. 87-96.

Research output: Contribution to journalArticle

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